Positron polarization in the decay of polarized 12N: a precision test of the Standard Model

Thomas, E.; Prieels, R.; Allet, M.; Bodek, K.; Camps, J.; Deutsch, J.; Gimeno‐Nogues, F.; Govaerts, Jan; Lang, J.; Naviliat‐Cuncic, O.; Pepe, I. M.; Quin, P.A.; Severijns, N.; Sromicki, J.

doi:10.1016/s0375-9474(01)01083-1

Cited by 28 publications

(27 citation statements)

References 37 publications

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“…The measurements were carried out in 107 In [38] and 12 N [39,40]. Since these are relative measurements, the contribution of the Fierz term cancels and the remaining sensitivity to exotic left-handed couplings is strongly suppressed.…”

Section: Limits On Real Scalar and Tensor Couplingsmentioning

confidence: 99%

Prospects for precision measurements in nuclear decay in the LHC era

2013

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Precision measurements in nuclear β decay offer a sensitive window to search for new physics beyond the standard electroweak model. Searches for new physics are also a strong motivation for experiments carried out at the high energy frontier. It is instructive to confront results from the low energy and the high energy frontiers in order to look for possible complementarities. This paper reviews the constraints on new physics obtained from nuclear and neutron decays and compares them to those from other semi-leptonic processes and from the LHC. The sensitivity requirements of new precision experiments in β decay, to impact the search for new physics at the light of current and projected LHC results, are updated. Experimental developments in nuclear and neutron β decay are discussed with emphasis on their projected goals to improve the limits on exotic weak couplings.

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Section: Limits On Real Scalar and Tensor Couplingsmentioning

confidence: 99%

Prospects for precision measurements in nuclear decay in the LHC era

2013

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“…This is to be compared to values ranging from 220 GeV/c 2 to 310 GeV/c 2 (90% C.L.) obtained from other experiments in nuclear and neutron β decay [77][78][79][80][81][82][83]. Constraints on the right-handed currents parameters δ and ζ from measurements of different observables in nuclear β decay, i.e.…”

Section: B Limits On Right-handed Currentsmentioning

confidence: 99%

“…Constraints on the right-handed currents parameters δ and ζ from measurements of different observables in nuclear β decay, i.e. the test of unitarity of the quark mixing matrix [69], measurements of the β asymmetry parameter in the decays of 19 Ne [31], 114 In [9] and 60 Co (this work), relative measurements of the longitudinal polarization of β particles in pure Fermi and Gamow-Teller transitions [86,87] and relative measurements of the longitudinal polarization of β particles emitted by polarized nuclei [77][78][79][80] C. Combined value for A for 60 Co…”

Section: B Limits On Right-handed Currentsmentioning

confidence: 99%

Precision measurements of theCo60β-asymmetry parameter in search for tensor currents in weak interactions

et al. 2010

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The β-asymmetry parameter A for the Gamow-Teller decay of 60 Co was measured by polarizing the radioactive nuclei with the brute force low-temperature nuclear-orientation method. The 60 Co activity was cooled down to milliKelvin temperatures in a 3 He-4 He dilution refrigerator in an external 13 T magnetic field. The β particles were observed by a 500 µm thick Si PIN diode operating at a temperature of about 10 K in a magnetic field of 0.6 T. Extensive GEANT4 Monte-Carlo simulations were performed to gain control over the systematic effects. Our result, A = −1.014 (12)stat (16)syst, is in agreement with the Standard-Model value of −0.987(9), which includes recoil-order corrections that were addressed for the first time for this isotope. Further, it enables limits to be placed on possible tensor-type charged weak currents as well as other physics beyond the Standard Model.

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“…It is to be noted that, whereas for ease of comparison results have been interpreted here in terms of the manifest LRS model and assuming the righthanded current mixing angle ζ = 0, limits from such experiments at low energies are complementary to those from experiments in muon decay or at colliders when interpreted in more general LRS models, as was shown e.g. in [44].…”

Section: Conclusion and Prospectsmentioning

confidence: 74%

“…Four such measurements have been performed, with 12 N and 107 In [40][41][42][43][44], all using the already mentioned technique of positronium hyperfine spectroscopy. In these measurements one determined either the ratio R + = P − /P + or R 0 = P − /P 0 , with P −,+,0 the longitudinal polarization for positrons emitted opposite to (P − ) or in the direction of (P + ) the nuclear polarization, or by unpolarized nuclei (P 0 ).…”

Section: Longitudinal Polarization Of β Particlesmentioning

confidence: 99%